NSSU
| Acronym | Definition |
|---|---|
| NSSU | Nonstop Software Upgrade |
| NSSU | Nippon Sport Science University (Japan) |
| NSSU | National Sunday School Union (now known as the National Christian Education Council) |
| NSSU | National Security Service of Ukraine (est. 1991) |
| NSSU | North Sydney Station Upgrade (railway station; Sydney, Australia) |